What is the common term for the infection known as onychomycosis?

Onychomycosis is medically defined as a fungal infection that affects the nails, leading to changes such as discoloration, thickening, and brittleness of the nail. The most common and widely recognized term for this condition is "nail fungus." This terminology is prevalent not only in the medical field but also among the general public, making it an easily understood descriptor of the condition.

The other terms presented do not refer to fungal infections. A hangnail refers to a small piece of skin that tears and hangs next to the nail, an ingrown nail occurs when the edges of the nail grow into the surrounding skin, and nail psoriasis is a condition where the nails appear pitted or discolored due to an autoimmune disorder. Each of these conditions involves different symptoms and causes, distinguishing them clearly from onychomycosis, reinforcing why "nail fungus" is the correct and most common term for this infection.